PI and RST Control Design and Comparison for Matrix Converters Using Venturini Modulation Strategy

This paper presents a thorough design and comparative study of two popular control techniques, i.e., classical Proportional Integral (PI) and RST, for Matrix Converters (MCs) in terms of tracking the reference and robustness. The output signal of MCs is directly affected by unbalanced grid voltage. Some research works have attempted to overcome this problem with PI control. However, this technique is known to offer lower performance when it is used in complex and nonlinear systems. On the other hand, RST control offers better performance, even in case of highly nonlinear systems. Therefore, the RST can achieve better performance to overcome the limitation of PI control of nonlinear systems. In this paper, a RST control method is proposed as output current controller to improve the performance of the MC powered by unbalanced grid voltage. The overall operating principle, Venturini modulation strategy of MC, PI control and characteristics of RST are presented.

无刷双馈风力发电系统的矩阵变换器励磁控制

矩阵变换器(MC)功率双向流通、谐波含量低,由矩阵变换器励磁的无刷双馈风力发电机(BDFWG)系统,无电刷、有功及无功功率可灵活控制,是一类越来越引起关注的变速恒频(VSCF)风力发电技术。为此研究分析了无刷双馈风力发电机和矩阵式变频器的模型;采用数字信号处理器(DSP)与复杂可编程逻辑控制器件(CPLD)的组合结构,制作了一台5kW的矩阵变换器样机;应用直接传递函数调制和4步换流的控制方法,在CCS2与MAX+plusⅡ环境下进行了软件编程,通过仿真结果和样机实验结果的对比分析,验证了系统设计的正确性和可行性,为矩阵变换器的实际应用提供了实验根据。